Geological Era(redirected from Era (geology))
Also found in: Dictionary, Thesaurus, Wikipedia.
an interval of time in the earth’s geological history, during which an erathem formed. Eras are subdivided into periods; several eras combine to form an eon. There are three eras in the most recent Phanerozoic eon: the Paleozoic, Mesozoic, and Cenozoic eras. (See alsoGEOCHRONOLOGY.)